# POST /api/v1/advisory-firms/{firm_id}/users/{user_id}/assignments

> Create staff assignment

- **Tag:** advisory-firm-teams
- **Operation ID:** `create_assignment_api_v1_advisory_firms__firm_id__users__user_id__assignments_post`

## Description

Assign a member to a business with optional engagement metadata.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Parameters

- `firm_id` (path, string, required)
- `user_id` (path, string, required)

## Request body

Schema: `CreateStaffAssignmentRequest`

- `business_id` (string · required) — Business to assign.
- `engagement_type` (string) — Type of engagement: tax_preparation, audit, bookkeeping, advisory, etc.
- `start_date` (string) — Engagement start date (YYYY-MM-DD).
- `end_date` (string) — Engagement end date (YYYY-MM-DD).
- `notes` (string) — Notes about the assignment.

## Responses

### 201 — Successful Response

Schema: `StaffAssignmentResponse`

- `id` (string · required)
- `user_id` (string · required)
- `business_id` (string · required)
- `firm_id` (string · required)
- `assigned_by` (string · required)
- `engagement_type` (string)
- `start_date` (string)
- `end_date` (string)
- `notes` (string)
- `created_at` (string · date-time · required)
- `updated_at` (string · date-time · required)

### 400 — Bad Request - Invalid input

### 401 — Unauthorized - Authentication required

### 403 — Forbidden - Insufficient permissions

### 409 — Conflict - Resource already exists

### 422 — Validation Error

Schema: `HTTPValidationError`

- `detail` (array · ValidationError) → `ValidationError`
  - `loc` (array · string | integer · required)
  - `msg` (string · required)
  - `type` (string · required)
  - `input` (object)
  - `ctx` (object)

## Code samples

### cURL

```bash
curl -X POST 'https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/users/{user_id}/assignments' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "business_id": "string"
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/users/{user_id}/assignments', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "business_id": "string"
}),
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

payload = {
  "business_id": "string"
}

response = httpx.post("https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/users/{user_id}/assignments", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/advisory-firm-teams/create-assignment
- OpenAPI slice: https://www.ondayzero.com/docs/reference/advisory-firm-teams/create-assignment/openapi.json
- Other endpoints in **advisory-firm-teams**: https://www.ondayzero.com/docs/reference/advisory-firm-teams